Rust release · Dec 11, 2025

Rust 1.92: what's new, what was stabilized

Short answerRust 1.92 was released on Dec 11, 2025: 17 newly stable APIs (NonZero<u{N}>::div_ceil, Location::file_as_c_str, RwLockWriteGuard::downgrade, Box::new_zeroed, ...); 5 compatibility notes that can affect existing code.

Dec 11, 2025release date

0language stabilizations

17APIs stabilized

-new edition

← Rust 1.91 All versions Rust 1.93 →

17 APIs stabilized

NonZero<u{N}>::div_ceil, Location::file_as_c_str, RwLockWriteGuard::downgrade, Box::new_zeroed, Box::new_zeroed_slice, Rc::new_zeroed, Rc::new_zeroed_slice, Arc::new_zeroed, Arc::new_zeroed_slice, btree_map::Entry::insert_entry, btree_map::VacantEntry::insert_entry, impl Extend<proc_macro::Group> for proc_macro::TokenStream, impl Extend<proc_macro::Literal> for proc_macro::TokenStream, impl Extend<proc_macro::Punct> for proc_macro::TokenStream, impl Extend<proc_macro::Ident> for proc_macro::TokenStream, <[_]>::rotate_left, <[_]>::rotate_right

Can it break my build?

The release lists these compatibility notes. Most only affect rare code, but read them before you raise your toolchain in CI:

Fix backtraces with -C panic=abort on Linux by generating unwind tables by default. Build with -C force-unwind-tables=no to keep omitting unwind tables.
As part of the larger effort refactoring compiler built-in attributes and their diagnostics, the future-compatibility lint invalid_macro_export_arguments is upgraded to deny-by-default and will be reported in dependencies too.
Update the minimum external LLVM to 20
Prevent downstream impl DerefMut for Pin<LocalType>
Don't apply temporary lifetime extension rules to the arguments of non-extended pin! and formatting macros

Use it

rustup update stable        # get the newest release
rustup install 1.92          # or exactly this one
rustup override set 1.92     # pin a project to it

To require at least this version from users of your crate, set rust-version = "1.92" under [package] in Cargo.toml. Cargo then refuses to build it on older compilers with a clear message, and with resolver 3 (the default on the 2024 edition, Rust 1.85+) it also prefers dependency versions that support it.

Full release notes

Language

Document MaybeUninit representation and validity
[Allow &raw [mut | const] for union field in safe code](https://github.com/rust-lang/rust/pull/141469)
Prefer item bounds of associated types over where-bounds for auto-traits and Sized
[Do not materialize X in [X; 0] when X is unsizing a const](https://github.com/rust-lang/rust/pull/145277)
[Support combining #[track_caller] and #[no_mangle] (requires every declaration specifying #[track_caller] as well)](https://github.com/rust-lang/rust/pull/145724)
Make never type lints never_type_fallback_flowing_into_unsafe and dependency_on_unit_never_type_fallback deny-by-default
Allow specifying multiple bounds for same associated item, except in trait objects
Slightly strengthen higher-ranked region handling in coherence
The unused_must_use lint no longer warns on Result<(), Uninhabited> (for instance, Result<(), !>), or ControlFlow<Uninhabited, ()>. This avoids having to check for an error that can never happen.

Compiler

Make mips64el-unknown-linux-muslabi64 link dynamically
Remove current code for embedding command-line args in PDB Command-line information is typically not needed by debugging tools, and the removed code was causing problems for incremental builds even on targets that don't use PDB debuginfo.

Libraries

Specialize Iterator::eq{_by} for TrustedLen iterators
Simplify Extend for tuples
Added details to Debug for EncodeWide.
iter::Repeat::last and count will now panic, rather than looping infinitely.

Stabilized APIs

These previously stable APIs are now stable in const contexts:

[<[_]>::rotate_left](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.rotate_left)
[<[_]>::rotate_right](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.rotate_right)

Cargo

Added a new chapter to the Cargo book, "Optimizing Build Performance".

Rustdoc

If a trait item appears in rustdoc search, hide the corresponding impl items. Previously a search for "last" would show both Iterator::last as well as impl methods like std::vec::IntoIter::last. Now these impl methods will be hidden, freeing up space for inherent methods like BTreeSet::last.
Relax rules for identifiers in search. Previously you could only search for identifiers that were valid in rust code, now searches only need to be valid as part of an identifier. For example, you can now perform a search that starts with a digit.

Compatibility Notes

Fix backtraces with -C panic=abort on Linux by generating unwind tables by default. Build with -C force-unwind-tables=no to keep omitting unwind tables.
As part of the larger effort refactoring compiler built-in attributes and their diagnostics, the future-compatibility lint invalid_macro_export_arguments is upgraded to deny-by-default and will be reported in dependencies too.
Update the minimum external LLVM to 20
Prevent downstream impl DerefMut for Pin<LocalType>
Don't apply temporary lifetime extension rules to the arguments of non-extended pin! and formatting macros

Release notes from the Rust project's RELEASES.md (MIT or Apache-2.0); summaries above are ours.